Max yogelgesang



(ModeL) M. VOGELGESANG.

SCREW PROPELLER.

No. 408,864. Patented Aug. 13, 1889.

WITNESSES:

N. PETERS. PlinwLim n hur, Washington, ac.

UNITED STATES PATENT OFFICE.

MAX VOGELGESANG, OF HOBOKEN, NE? JERSEY, ASSIGNOR OF ONE-HALF TO JOHN H. BONN, OF SAME PLACE.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent Ive/408,864, dated August 13, 1889.

Application filed March 6, 1889. Serial No. 302,166. (ModeL) To all whom it may concern.- face a of the blade A is arranged at the point Be it known that I, MAX VOGELGESANG, of of greatest width of the blade, from which the Hoboken, in the county of Hudson and State concavity of the face diminishes graduallytoof New Jersey, a citizen of Germany, have inward the hub and point of the blades. The

vented certain new and useful Improvements front or cutting edge of each blade is made in in Screw-Propellers, of which the followingis the shape of an obtuse angle, so as to form a a specification. projection or nose I), which is located at the This invention relates to certain improvepoint of the greatest Width of the blade. ments in the construction of screw-propellers From the projection or nose I) of the cutting- [O for vessels by which a more effective working edge extends at the rear side of the blade an of the propeller and a steadier and smoother inclinedtransverse ridge 1') c, the inner edge motion of the same, even at high speed, is obof which is connected with thehub B and the tained; and the invention consists of a screwpoint of the blade by a longitudinal ridge (Z propeller the blades of which are secured to c e, as shown in Figs. 2 and 4. The ridges b T5 the hub at an angle of inclination to the axis a and d c a form with the edges of the blade 6 5 of the same, and slightly concaved on their A three slightly-concaved faces, that incline working-faces toward the cutting-edges of the from the point of greatest thickness formed blades, which cutting-edges are made with an at the intersection of the transverse ridge b c obtusely-angled projection or nose that is with the longitudinal ridge (Z c 6. By the ro- 20 connected by a short inclined ridge with a tation of the blades on the axis of the hub in longitudinal ridge,which ridges form inclined the direction of the arrow shown in Fig. 2, faces at the rear side of each blade, so as to the angular front orcutting edges cut through conduct the water parallel, or nearly so, with the water and conduct it between the blades the working-faces of the blades, and produce along the inclined faces Z) c d and b c e at the 2' 5 an increased effectiveness and a steady morear of the blades, and over the longitudinal tion of the propeller. ridges d c 6 toward the straight rear edges of In the accompanying drawings, Figure l the blades in such a manner that the water is represents a perspective View of my improved passed through between the blades in a direcscrew-propeller. Figs. 2 and 3 are respecttion nearly parallel, or, at least, at a very o ively a rear view of one of the blades and a oblique angle, to the working-faces a of the side elevation of the same; and Fig. 4 is a blades, so that said Working-faces are very side view of one of the blades of the propellittle, if at all, affected by the backwardly- 1er-screw, showing different cross-sections of moving body of water forced through between the same, taken on lines parallel to the axis of the blades of the screw. The inclined guide- 3 5 the screw, said cross-sections being developed faces formed on the rear sides of the blades into a vertical plane with the section-lines as serve thus to impart to the body of water that the base thereof. is forced through between the blades during Similar letters of reference indicate come the forward motion of the vessel a clearly-desponding parts. fined direction, which is parallel or nearly 40 A A in the drawings represents the blades parallel with the working-faces of the blades. of my improved screw-propeller, and B the It is conceded that the inclined guide-faces hub of the same. The blades Aare arranged formed by the longitudinal and transverse at an angle of inclination to the axis of the ridges at the rear sides of the blades, exert hub, as customary in screw-propellers. The a certain resistance against the forward mo 45 working-face a of each blade A is slightly tion of the screw in ax1ald1rect1on,and cause 5 concaved toward the front or cutting edge of thereby a small loss of power to the same; but the same, the degree of concavity being ractical tests made with my improved screw clearly indicated in the cross-section, taken at have clearly established that this small loss of different points of the blade, as shown in. Fig. power is more than compensated by the de- 50 4. The greatest concavity in the workingcreased slip produced by the direction im- 10o the obtusely-angled front or cutting edges of the blades,wliieh latter are re-enforeed at their rear sides by an inclined transverse ridge, and a longitudinal ridge extending from the inner end of the transverse ridge toward the hub and point of the blade, so as to form inelin ed guide-facesby which the Water passin over the ridges is conducted oil in a direction nearly parallel to the working-faces of the blades, substantially as fet forth.

2. A screw-propeller having radial blades inclined to the axis of the propeller and obtuse-angled front or cutting edges, and in,- clined guide-faces formed at the rear sides of the blades by an inclined transverse ridge, and a longitudinal ridge that extends from the inner end of the transverse ridge toward the hub and the point of the blades, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in pres ence of two subscribing witnesses.

MAX VOGELGESANG.

Witnesses:

PAUL Gonrnn, CHAS. Kama 

